Additionally, while failures are noted in the client’s browser console (that most users are not aware of), you can have them sent back to your server by adding a ‘report-uri’ attribute with an appropriate handler:

AJAX = Asyncronous (but not always), JavaScript, XML (Text or JSON). These technologies have been around almost as long as the Internet itself, but have only recently been used together to change the way that web applications are built.

XMLHTTPRequest is an API used mainly by browser-based Javascript applications to send and retrieve data from servers. It was developed originally by Microsoft for Exchange Server’s Outlook Web Access, but it has since been widely supported in browsers and is the heart of AJAX dynamic Web applications.

I’ve messed with many of the frameworks available online, and while they are very good, I’ve routinely found issues or features that they lack. Over time I’ve cobbled together my own framework, I fully expect this to change over time, but publish it here for your consideration!

The XSS methods (and “otherHost” variable) are provided as MSIE6 allows for Cross-site Scripting here. MSIE7 and Mozilla will indicate errors if connections are attempted to a ‘non-originating host’. I’ve exploited this vulnerability in a few applications, as such I provide the test for you too!

NOTE: The example response program is written in PHP, but should be easily ported to any other language.